What does 1bar mean?

Bar is the unit of pressure, 1 bar (bar) = 100 kilopascal (kPa) = 10 Newtons/square centimeter (N/cm?) = 0.1MPa.

Bar (symbol bar) and millibars (symbol mbar, also known as mb) are both. They do not belong to the SI system of units or the centimeter-gram-second system, but are accepted for use with SI units. Because bar is similar to atmospheric pressure, it is widely used to describe pressure. It is legally recognized in the countries of the European Union.

Extended information:

Air pressure is usually measured in millibars. For example, standard atmospheric pressure is defined as 1013.25 millibars (hundred Pascals), which is equal to 1.01325 bar. Meteorologists around the world have long used millibars as one of many units for measuring atmospheric pressure. This resulted in the SI unit pa taking some time to become widely adopted.

Millibars are still widely used, although officials in various countries are gradually transitioning to the international unit where the number is actually the same: hPa (hundred Pascals). However, because the "hecto" prefix indicating one hundred is rarely used in other fields, "kilopascal" is usually used instead. For example, in Canadian weather forecasts, kPa (kilopascal) is usually used as the unit, also known as cbar (centibar).

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